He is a Transpersonal Psychologist/scientist who has compiled tons of data on subjects who took LSD under experimental conditions. You may find many "transendental" or "beyond the cave" types of anecdotal reports you can refer to from his prolific research. Many people have claimed to have had epiphanies from taking certain psychactive drugs. (And aren't "epiphanies" and enlightenment what emerging from the cave is all about...?)
Begin here at his website:
http://www.paradigm-sys.com/cttart/
Another hallucinogen researcher was Terence McKenna, Timothy Leary's buddy, who just died this year. I will get you his website, too. There are audio interviews archived on the Net which you could listen to on him if you really want to delve into it.
Best of Luck to you!
P.